Pulping apparatus.



H. L. KUTTERJ PULPING APPARATUS.

APPLICATIONJILED OCT. 29. 1914.

1,162,292. Patented Nov. 30, 1915.-

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v I Witnesses: Inventor Attorney H. L. KUTTER. PULPING APPARATUS.

APPLICATION F lLED OCT. 29. I914.

- Patented Nov. 30, 1915.

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. 1 Inventor Z7 L0,, s 235/ Witnesses: was

Attorney UNITED STATES PATENT OFFICE HERMAN L. KUTT'ER, 0F HAMILTON, OHIO, ASSIGNOB' OF ONE-FOURTH TO JOHN F. KING AND ONE-FOURTH TO JAMES P. NEAR-Y, BOTH OF KALAMAZOO, MICHIGAN, AND ONE-FOURTH TO FRANK G. TROWBRIDGE, 0F HAMILTON, OHIO.

PULPING APPARATUS.

Specification of Letters Patent.

Application filed October 29 1914. Serial No. 869,367.

To all whom it may concern.

Be it known that I, HERMAN L. KUTTER, a citizen of the United States, residing at Hamilton, Butler county, Ohio, have invent-.

ed certain new and useful Improvements in Pulping Apparatus, of which the following is a specification.

This invention, pertaining to improvements in apparatus for the production of pulp in paper-making, will be readily understood from the following description taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of an apparatus exemplifying my invention, portions appearing in vertical section in the plane of line a of Figs. 2, 3 and 4: Fig. 2 a plan of the same: Fig. 3 a front elevation of the same: and Fig. 4 a vertical longitudinal section of the beating agent in the plane of line b of Figs. 1 and 2.

In the drawings: 1, indicates a tank adapted to receive the stock to be dealt with: 2, the open top of the tank: 3, a dotted line indicating a typical level at which the stock may be carried in the tank: 4, a horizontal circular casing, illustrated as enlarging from each end toward the center, this casing being disposed at a point below the level at which the stock is to be carried in the tank: 5, a conduit connecting the center of length of easing 4 with the upper portion of the tank: 6, a stop-valve disposed in conduit 5 near casing 4: 7, the outlet opening placing the casing 1n communication with the base of conduit 5, below the stop-valve: 8, a pair of conduits leading from the tank to the ends of easing 4, these conduits converging and joining rearwardly so that their rear portions form a substantial portion of the tank itself: 9, a stop-valve in each of the conduits 8 where the conduits join casing 4: 10, an outlet-valve controlling an opening from casing 4; at some low point therein, and disposed, preferably, at the midlength of casing4, below outlet, opening 7 11, a rotor disposed within casing 4 and fitting the interior thereof, this rotor being provided with coarse threads trending in opposite directionsfrom the center of length of the rotor: 12,the shaft of the rotor, journaled in casing 4: and adapted to be turned continuously by power: and 13, inlets leading into the casing from conduits 8 and controlled by the valves 9.

Assume valves 9 to be open and valve 10 closed and valve 6 closed, and that the tank be filled with water and paper-stock, say old newspapers, and that the rotor is in motion in the direction of the arrow. The stock goes to the ends of easing 4 and the rotor, owing to its threads, urges the stock from the ends of the casing toward the center of length of the casing, and the coaction between the periphery of the threaded rotor and the interior of the casing tends to break up and draw out the stock and force it to ward the center of length of the casing. The rotor, in thus forcing the stock inwardly from the ends of the casing acts asa pump and produces at the center of length of the casing a pressure of stock in excess of the pressure of stock at the ends of the casing. The result of this pumping action is to tend to force the stock upwardly in conduit 5. The stock forced upward in conduit 5, when valve 6 is opened goes to [the tank and replaces stock going from the tank to the ends of the casing through conduits 8. The result is that, between the forcing action of the rotor, and the gravity action through conduits 8, the stock is moved continuously in a circuit through the casing resulting in its being more and more reduced to pulp until the stock is sufficiently reduced to pulp.

-The pulping efi'ect produced upon the stock by the action of the rotor is dependent very largely upon the resistance tending to prevent the outflow of pulp from the casing. In other words, if theoutlet from the easing into the tank were entirely free then the retardation of the movement of the pulp through the casing toward that outlet would be due to the friction of the pulp as it moved through the casing, and if this movement was very free there might be but little reducing eifect produced upon the pulp. If valve 6 in conduit 5 were to be Patented Nov. 30, 1915. i

satisfactory degree of reduction of the pulp;

the process would not be at all continuous or economical. But by adjusting valve 6 the resistance of the flow from the casing to the tank can be regulated at will, thus permitting the flow through the casing to be retarded Without negativingr the continuity of the reducing process. alves 6 and 9 may be, closed when it isdesired to have access to the interior of the casing without the necessity for the emptying ofthe tank.

I claim 1. Pulping apparatus comprising, an

open-topped tank adapted to receive stock and Water to be reducedto pulp, a' substan tially cylindrical casing-below the top of the stock in the tank, an inlet from the tank to the ends of said casing, an outlet from the midlength of the casing to said tank, and a threaded rotor fitted for rotation within said casing and adapted to force the material from the inlets at the ends of portion of the tank, a thread for rotation within said casing and adapted.

the level of said casing and having its base bifurcated to form a pair of conduits lead-' ing to the inlets to the casing and having its upper portion contracted and extended downwardly to form a conduit connected with the central portion of the casing, combined substantially as set forth.

3. Pulping apparatus comprising, a tank adapted to receive stock and water to be reduced. to pulp, a substantially cylindrical casing below the top .of the stock in the tank, an inlet from the base of the tank to one portion of'said casing, an outlet from another portion of the casing to the upper rotor fitted to force the material from the inlet to the outlet of the casing and to simultaneously cooperate with the casing in breaking up and drawing out the stock, and a valve disposed at said outlet from the casing and serving in regulating the resistance of the stock being forced from the casing, com- I bined substantially as set forth.

HERMAN L. KUTTER.

Witnesses: GEO. JOHNSON, M. S. BELDEN. 

